pajero 2.8 Vibration

Thelostcountry · 25-02-2015 9:28pm #1

Terrible vibration coming from the rear, the U joint was fecked replaced that but did not sort the vibration :rolleyes: comes in at 50 mph and gets worse as speed increases .there is a slight leak at the Diff(pinion) it is full of oil. Diff maybe fecked although surely it would be whining

Cheers.

TrailerBob · 25-02-2015 10:05pm

Perhaps the prop needs to be balanced.. Could account for it.

Otherwise, check the bearing for play as it joins to the gearbox.

Thelostcountry · 25-02-2015 10:29pm

TrailerBob wrote: »

check the bearing for play as it joins to the gearbox.

there is a slight bit of play but nothing major ....

Cheers for reply.

CJ Haughey · 26-02-2015 12:55am

Check the tyres anyway first for eggs.

Thelostcountry · 03-03-2015 9:21pm

Pile a ****e is still vibrating. I removed rear drive. drove it in 4wd no vibration present :eek: dropped the oil out of diff(for the crack) oil was perfect, not one bit of a metal filing on bung magnet .

So... its either shaft needs balancing or bearing in on the box rear gearbox mounts seem to be ok but i am going to double check :rolleyes:

TrailerBob · 03-03-2015 9:35pm

If only somebody suggested that a week ago...:D

Thelostcountry · 03-03-2015 9:48pm

TrailerBob wrote: »

If only somebody suggested that a week ago...:D

Yes Bob You mention that...

Where does one get a shaft balanced ?

Desolation Of Smug · 03-03-2015 10:04pm

If there's wear in the diff, that will cause the same symptoms. Pop off the rear cover and see if the sun and planet gear bearings are shot. Unless you hit the driveshaft, it shouldn't have gone out of balance.

TrailerBob · 03-03-2015 10:18pm

Just being ironic... Long day today....

A chap I know gets them done here if necessary.. Not too often mind.

http://driveshaft.ie/about-us/

If the Vibration is gone with the shaft off, then I'd suspect the shaft itself. When the UJ was done, was the shaft split? If the inner shaft was removed, it could have been reassembled out of phase... ie the end yoke is perhaps at 90 degrees to where it was.

Desolation Of Smug · 04-03-2015 12:29am

TrailerBob wrote: »

Just being ironic... Long day today....

A chap I know gets them done here if necessary.. Not too often mind.

http://driveshaft.ie/about-us/

If the Vibration is gone with the shaft off, then I'd suspect the shaft itself. When the UJ was done, was the shaft split? If the inner shaft was removed, it could have been reassembled out of phase... ie the end yoke is perhaps at 90 degrees to where it was.

If the rear diff isn't being drivven, it won't vibrate...I have seen lads get drives balanced to no avail, then open the diff and find that it is in bits with no bearings left at all, and still driving. Usually a used axle sorts it easier than shimming in a used/new diff. It could well be the propshaft, but if it isn't....

Kevin McCloud · 04-03-2015 12:33am

Desolation Of Smug wrote: »

If the rear diff isn't being drivven, it won't vibrate...I have seen lads get drives balanced to no avail, then open the diff and find that it is in bits with no bearings left at all, and still driving. Usually a used axle sorts it easier than shimming in a used/new diff. It could well be the propshaft, but if it isn't....

Wouldnt you imagine they be metal of some pedigree stuck to the magnet? agree though about the driveshaft not gone out of balance unless it got molested off roading and struck rocks etc.

Desolation Of Smug · 04-03-2015 12:36am

Kevin McCloud wrote: »

Wouldnt you imagine they be metal of some pedigree stuck to the magnet? agree though about the driveshaft not gone out of balance unless it got molested off roading and struck rocks etc.

Dunno tbh - ever seen the transit ones where the bearings break up into dust and mix with the oil into a dirty brown sludge? Feck all metal to be seen, but not a screed of bearing left.

Kevin McCloud · 04-03-2015 12:38am

Desolation Of Smug wrote: »

Dunno tbh - ever seen the transit ones where the bearings break up into dust and mix with the oil into a dirty brown sludge? Feck all metal to be seen, but not a screed of bearing left.

Transits are chocolate though, fair point though. Diff cover off as you say.

Thelostcountry · 08-03-2015 11:31am

Stupidly there is no back plate(solid axle casing:rolleyes:) for bearing inspection. will have to take the whole diff out!

For anyone that is interested, I will report back later in the week.

Cheers.

Desolation Of Smug · 08-03-2015 12:45pm

Thelostcountry wrote: »

Stupidly there is no back plate(solid axle casing:rolleyes:) for bearing inspection. will have to take the whole diff out!

For anyone that is interested, I will report back later in the week.

Cheers.

Don't bother - put the back up in the air, wheels off the ground, use railway sleepers or whatever, and run it through the gears, as in actually drive it through the gears with the wheels spinning off the ground - make sure you chock the front wheels well and have it 100% supported. You won't be long seeing what's vibrating.

Dozer Dave · 08-03-2015 3:06pm

Have you Lsd op?

Thelostcountry · 08-03-2015 9:07pm

Dozer Dave wrote: »

Have you Lsd op?

No LSD Dave.

Dozer Dave · 08-03-2015 10:32pm

Are you sure yours is an open diff, thought all 2.8s had lsd. The jdm ones anyway.

Thelostcountry · 09-03-2015 10:39am

Dozer Dave wrote: »

Are you sure yours is an open diff, thought all 2.8s had lsd. The jdm ones anyway.

Sorry Dave, You are right,it has an LSD!!

Thelostcountry · 16-03-2015 12:12am

Finally got a chance to remove Diff. Crown and pinion look perfect! Cant see spider gears or Bearings yet as i have not striped it down. I'm not convinced it is the Diff, although I did hear a noise with her up in the air in 5th, was deffo from Diff, could have just been the sound of crown and pinion meshing

Anything else I should be looking out for??

I could do with a manual for specs preload,torque settings etc etc....

Kevin McCloud · 16-03-2015 12:17am

Are your trailing arm bushes all good?

Thelostcountry · 17-03-2015 10:19am

Kevin McCloud wrote: »

Are your trailing arm bushes all good?

TBH I don't know Lad... will check.

Cheers.

Thelostcountry · 21-03-2015 11:11pm

Nothing wrong with Diff anyway, all bearings perfect,gear pattern perfect. Back lash sound. what a waste of time taking the fooking thing out, should of known myself, when i dropped the gear oil and nothing on the magnet :rolleyes::rolleyes:

Desolation Of Smug · 23-03-2015 12:18am

Thelostcountry wrote: »

Nothing wrong with Diff anyway, all bearings perfect,gear pattern perfect. Back lash sound. what a waste of time taking the fooking thing out, should of known myself, when i dropped the gear oil and nothing on the magnet :rolleyes::rolleyes:

So what's feckin causing the vibration then? If the tyres are good, the wheel bearings are good, the wheels are balanced,the prop is straight and balanced, the prop bearings are good, the gearbox output bearings are sound, and you've checked all them, then it's what??:rolleyes:

After going through the obvious list I just banged up on a fair few yokes, and finding nothing, it has turned out to be the diff. But generally, it's one of the obvious things.

pablo128 · 23-03-2015 12:26am

@ 50 mph onwards, there's a good chance it could simply be wheel balancing. I would start with making sure there isn't mud caked on the inside of the wheels. I've seen that plenty of times on jeeps. Then get all 4 wheels balanced, or at least checked on a balancing machine.

And don't listen to anyone telling you that you don't need to balance the rears. If they are out by enough, they will vibrate at speed.

Kevin McCloud · 23-03-2015 12:31am

Desolation Of Smug wrote: »

So what's feckin causing the vibration then?

Its worse than waiting on a story line in Eastenders this. :pac:

Desolation Of Smug · 23-03-2015 12:33am

pablo128 wrote: »

@ 50 mph onwards, there's a good chance it could simply be wheel balancing. I would start with making sure there isn't mud caked on the inside of the wheels. I've seen that plenty of times on jeeps. Then get all 4 wheels balanced, or at least checked on a balancing machine.

And don't listen to anyone telling you that you don't need to balance the rears. If they are out by enough, they will vibrate at speed.

I had kinda assumed all the obvious stuff had been checked tbh. I watched a lorry get pulled apart looking for a vibration that had a house-brick lodged up between the rear dual wheels.....Yeah, I kinda lolled.

Kevin McCloud · 23-03-2015 12:37am

Desolation Of Smug wrote: »

I had kinda assumed all the obvious stuff had been checked tbh.

Its often bad diagnosis happens, like your story with the lorry is a classic example.

pablo128 · 23-03-2015 12:37am

Desolation Of Smug wrote: »

I had kinda assumed all the obvious stuff had been checked tbh. I watched a lorry get pulled apart looking for a vibration that had a house-brick lodged up between the rear dual wheels.....Yeah, I kinda lolled.

I got a lad to check the tyre pressures on a car before I done 4 wheel alignment on it. Road tested it after and it was pulling all over the place. 2 hours and 3 more attempts at the tracking before I checked the tyres myself and discovered the lying b@stard hadn't checked the pressures at all. 2 tyres on one side were low. I could have choked the dirty kunt.:mad:

Desolation Of Smug · 23-03-2015 12:40am

Kevin McCloud wrote: »

Its often bad diagnosis happens, like your story with the lorry is a classic example.

Sadly, I owned that renault/dodge truck at the time and was paying the bills...the driver got all sheepish and explained that he'd "just got fed up of the shaking..." and asked the workshop to pull the drive-line apart..

Kevin McCloud · 23-03-2015 12:44am

Desolation Of Smug wrote: »

Sadly, I owned that renault/dodge truck at the time and was paying the bills...the driver got all sheepish and explained that he'd "just got fed up of the shaking..." and asked the workshop to pull the drive-line apart..

That was a saucy bill for nothing.

pajero 2.8 Vibration

Comments